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Distribution of iron cations in natural chromites at different stages of oxidation: a {sup 57}Fe Moessbauer investigation

Journal Article:

Abstract

{sup 57}Fe Moessbauer spectroscopic investigation of natural chromites from two chromite deposits of India (Sukinda and Byrapur) documents partly inverse spinel structure arising out of oxidation. The spectral fitting was based on allowing a disordering distribution of Fe{sup 2+} and Fe{sup 3+} ions at tetrahedral (A) and octahedral (B) sites. Moessbauer investigation of the samples taken from the physico-chemically distinct two horizons of Sukinda viz. brown ore and grey ores, and Byrapur area revealed three types of iron ion distribution as: Fe{sup 2+}(A), Fe{sup 3+}(A) and Fe{sup 2+}(B) (GC-group); (b)Fe{sup 3+}(A{sub 1}), Fe{sup 3+}(A{sub 2}) and Fe{sup 2+}(B) (BC-2 group), and (c) Fe{sup 3+}(A{sub 1}), Fe{sup 3+}(B) (BC-1 group). The distribution pattern of iron cations at A and B sites was linked to the degree of oxidation. These stages of oxidation could be modelled from normal to inverse form. A model suggesting `electron localisation` at the B-sites makes the intermediate stage. Iron site occupancy determined by Moessbauer spectroscopy of the presently studied samples indicates that these fall under three groups of oxidation stages. An early stage of oxidation is shown by samples of group GC, intermediate stage by group BC-2 and final stage by BC-1 group of chromite samples. The  More>>
Authors:
Pal, Tapan; Mitra, Sachinath; [1]  Moon, Hi-Soo [2] 
  1. Jadavpur Univ., Calcutta (India). Dept. of Geological Sciences
  2. Yonsei Univ., Seoul (Korea, Republic of). Dept. of Geology
Publication Date:
Jul 01, 1994
Product Type:
Journal Article
Reference Number:
SCA: 665100; PA: AIX-26:054088; EDB-95:094067; SN: 95001414802
Resource Relation:
Journal Name: Journal of the Geological Society of India; Journal Volume: 44; Journal Issue: 1; Other Information: PBD: Jul 1994
Subject:
66 PHYSICS; CHROMIUM ORES; IRON 57; MOESSBAUER EFFECT; CATIONS; CHEMICAL COMPOSITION; CHEMICAL STATE; CHROMIUM OXIDES; ELECTRON MICROPROBE ANALYSIS; GEOLOGIC DEPOSITS; IRON; IRON OXIDES; OXIDATION; SPECTRA
OSTI ID:
66017
Country of Origin:
India
Language:
English
Other Identifying Numbers:
Journal ID: JGSIAJ; ISSN 0016-7622; TRN: IN9500822054088
Submitting Site:
INIS
Size:
pp. 53-64
Announcement Date:
Jul 13, 1995

Journal Article:

Citation Formats

Pal, Tapan, Mitra, Sachinath, and Moon, Hi-Soo. Distribution of iron cations in natural chromites at different stages of oxidation: a {sup 57}Fe Moessbauer investigation. India: N. p., 1994. Web.
Pal, Tapan, Mitra, Sachinath, & Moon, Hi-Soo. Distribution of iron cations in natural chromites at different stages of oxidation: a {sup 57}Fe Moessbauer investigation. India.
Pal, Tapan, Mitra, Sachinath, and Moon, Hi-Soo. 1994. "Distribution of iron cations in natural chromites at different stages of oxidation: a {sup 57}Fe Moessbauer investigation." India.
@misc{etde_66017,
title = {Distribution of iron cations in natural chromites at different stages of oxidation: a {sup 57}Fe Moessbauer investigation}
author = {Pal, Tapan, Mitra, Sachinath, and Moon, Hi-Soo}
abstractNote = {{sup 57}Fe Moessbauer spectroscopic investigation of natural chromites from two chromite deposits of India (Sukinda and Byrapur) documents partly inverse spinel structure arising out of oxidation. The spectral fitting was based on allowing a disordering distribution of Fe{sup 2+} and Fe{sup 3+} ions at tetrahedral (A) and octahedral (B) sites. Moessbauer investigation of the samples taken from the physico-chemically distinct two horizons of Sukinda viz. brown ore and grey ores, and Byrapur area revealed three types of iron ion distribution as: Fe{sup 2+}(A), Fe{sup 3+}(A) and Fe{sup 2+}(B) (GC-group); (b)Fe{sup 3+}(A{sub 1}), Fe{sup 3+}(A{sub 2}) and Fe{sup 2+}(B) (BC-2 group), and (c) Fe{sup 3+}(A{sub 1}), Fe{sup 3+}(B) (BC-1 group). The distribution pattern of iron cations at A and B sites was linked to the degree of oxidation. These stages of oxidation could be modelled from normal to inverse form. A model suggesting `electron localisation` at the B-sites makes the intermediate stage. Iron site occupancy determined by Moessbauer spectroscopy of the presently studied samples indicates that these fall under three groups of oxidation stages. An early stage of oxidation is shown by samples of group GC, intermediate stage by group BC-2 and final stage by BC-1 group of chromite samples. The imprint of progressive oxidation manifested by Fe cation site occupancy has been correlated with the Fe{sup 2+}/{Sigma}Fe ratios, obtained for each group of samples. (author). 39 refs., 2 figs., 3 tabs.}
journal = {Journal of the Geological Society of India}
issue = {1}
volume = {44}
journal type = {AC}
place = {India}
year = {1994}
month = {Jul}
}